In his latest mock draft released Tuesday, ESPN NFL Draft expert Todd McShay says that he's been hearing the same.

"I've heard from three league sources in the past week that the Bills are trying to trade up," McShay writes. "If they do make a move, it'll likely be to land [Jadeveon] Clowney, [Greg] Robinson or [Sammy] Watkins."

Of the three, Robinson would seem to be the least likely target for a trade-up. The Bills could potentially select Texas A&M's Jake Matthews or Michigan's Taylor Lewan at No. 9 and fill their need at offensive tackle, without giving up the significant assets it could take to acquire Robinson at the top of the round.

Meanwhile, Watkins and Clowney are considered top-flight prospects at their positions. Trading up for Watkins would give EJ Manuel another offensive weapon, while Clowney would give the Bills -- already well-stocked with Mario Williams, Kyle Williams, and Marcell Dareus -- the NFL's best defensive line.

Yet trading up as far as No. 1 would likely require the Bills to give up their No. 9 pick, their 2015 first-round pick, and potentially more. We explored the impact of such a move Monday.